Perforating-machine



D. NOBLE.

PERFORMING MACHINE.

APPLICATION FILED JULY I4, I9I9.

1,382,378, Eatented June 21, 1921.

I IIIIIIIIIIIIIIIIIIII INvENToR MJ/J/W/e.

ATTORNEY i UHTE DONALD NOBLE, OF BRDGEPORT, CONNECTCUT, ASSIEGNOR 'lO THE SllG-'ER MANU- FACTURIITG COMPAI EL, fi CQRPGRATON 0F NEV JERSEY. i

PERFORATING--MACHNEJ Application filed luly M,

To all fw /iom t may concer/n1:

le it known that DONALD Noemi, a suhject oil1 the ling of iireat Britain, residingl at Bridgeport, in the county or' hairiield and citate or Connecticut, have invented certain new and useful improvements in Perforating-ll/lachines, of which the following is a specilication, reference being,` had therein to the accoinl'ianying drawings.

This invention relates to a machine for operating' upon leather or other sheet material and is more speciiically intended as an iinproven'ient upon the perforating machine disclosed in the application ot Donald Noble, Ser, No. 232,744, tiled May 6, 1918, although certain teatures ot the present invention are equally applicable to leriorating; machines el? other types.

llzlachines of the above character are normally intended tor formino; series ot' small pertorations in sheet material by a succession ot rapidly repeated blows, and the 'feeding oi? the Work into position for forming the successive pcrtorations is accomplished by a lateral movement of the punch carrier While the punch is in engagementivith the Work.

These machines are at times employed for forming a series ci scallops alongl the edge of the material, employing` tor this purpose a punch having a substantil'illy semi-circular cutting' edge. ln making use of a punch of this character difficulty is experienced in securing; a proper toed oi the work, as the punch frequently slips alena' the edge of the material Without moving); the latter to the proper distance thus producing detective Workh The present invention provides material teedingr means associated with the punch carrier and having` a lateral reciprocating movement sutlicient to properly feed the Work regardless oit the type oi punch ernployef.

This invention further contemplates feed mefhanisrn`i''or the material having elements contacting with opposite sides ot the material and which serve to positively logrip the material 'for moving it in the direction ot feed.

,ln machines of the character above noted it is usual to the punch in a holder which is removably mounted in the punch carrier. fis the punches employed. :must be varied in Specification of Letters Patent.

1919. Serial No. 310,690.

accordance with the pattern to he Jformed in the material, it is necessary for the operator to remove the punch holder at frequent ntervals from the carrier to permit the substitation of another havingl diilerently shaped or arranged punches. ln replacing the holder it is very important that it shall not drop from its proper position in the carrier While the operator is tightening' the retainingl clamp or upon any inadvertent loosening` of the clamp'during operation, as such an occurrence y cause the ininch-holder to protrude so rar from the carrier as to cause serious `iamage to the machine upon reciprocation of the carrier.

rhis invention provides for preventing such an accident by furnishing` the punch holder and carrier with interengaging parts which are automatically brought into holding relation upon insertion of the holder in the carrier and Twhich retain the holder in propo position during the tightening of the holding; clamp and prevent dropping of the holder it the clamp becomes loose during` operation of the machine. Y

The present invention further provides a novel and. simple means ior securing; the iudividual punches in the holder whereby they are iirrnly positioned during operation, but which permits the ready removal of punches therefrom when necessary for repair.

@their objects and advantages of the present invention, together with improved details ot construction and advantageous combinations et parts will he'hereinatter more tullv described in the specification and partieularlv set forth in the claims, reference beine; ha d to the annexed drawing' as disclosa preferred embodiment thereof and in ivhich.-

Figure l a partial transverse section to cnlaruofil scale through the punch carrier showing the punch holder and chip agitator in iront elevation;

Fic; 2 is a transverse section to enlarged scale through the punch carrier, punch holder and chip agitator looking from the front;

3 is a bottom plan view or the parts shown in Fie'. l;

Fig, l is a. cross section on the line ci-o l. looking; in the I,direction of the arrows;

Patented J une 2i, i

. machine Fig. 5 is a diagrammatic detail showing the type of work performed by the punch herein disclosed; n

Fig. 6 is a view similar to Fig. 2 but relating to a modified form of the device; and

Fig. 7 is a bottom plan view of holder 74 illustrating the employment of a modified form of feed member.

rlhe present invention is designed more particularly for embodiment in the type of disclosed in the application of Donald Noble, Serial No. 232,744, filed May 6, 1918, to which application reference may be had for full disclosure of details of construction not herein shown.

is a bearing bracket mounted upon the machine frame, said bracket being adapted to have imparted thereto a reciprocating` movement in the direction of work feed. Such movement may be imparted by the mechanism disclosed inV the above referred to application or in any other suitable manner. The bea-ring member` 65has mounted therein for vertical sliding movement a tubular punch carrier 67 the latter compris ing an upper portion of cylindrical form of relatively small diameter and a lower tubular portion. 68 of greater diameter, the interior of which forms a receiver 95 for punchings or chips removed from the material when a tubular punch is employed. rlhe enlarged lower portion of the punch carrier is provided at 69 with a pair of opposed bearing` bosses of which one only is shown, said bosses being pivotally supported in the lower ends of operating links 59, 60such links being adapted to receive a vertical reciprocating motion by means of cams or in other suitable manner, the particular mode of operating these parts not being within the scope of the present invention.

`Screws 70, 7l having enlarged heads are engaged with threaded .openings in the bosses G9 and serve to hold the links 59, 60 in proper relation Jthereto.

, The lower extremity of the tubular punch carrier is open and is arranged for the rcception of sleeve 73 integral with the disk 74, which, together with the disk 75, comprisesthe punch holder. Disk 75 has. one or more suitable taper openings single, central opening beingillustrated herein) for he reception of the shank portionsvof punches of the desired character. The disk 7 4 is provided with an opening 76l of a di ameter substantially equal to the internal diameter of the punch shank and co-axial with the opening in disk 75. The punches are inserted from the upper side of disk 7 5 which is then secured in position by means of screws 74a, the upper or rear end of the punch shankthus resting against plate 74 which serves as an abutment therefor. By separating` disk 7 5 from disk 74, the punch may readily be removed for repair or re placement by subjecting it to a slight blow upon its forward or cutting extremity. Vifhile the device herein disclosed is entirely suitable for holding` and using tubular punches, it is particularly intended for use with open punches, such for example as that snown at V76, having tubular shank portions and substantially semi-circular cutting edges 7 6X.

rlhe punch carrier is longitudinally slit at its lower extremity near the rear portion thereof to form a slot 68a, and is provided with a pair of outstanding gears 77 located on opposite sides of said slot through which is passed a bolt or screw 78. by means of which the opposite edges of the slot may be drawn together, thereby decreasing the interior diameter of the tubular punch carrier, which is of suiiiciently resilient material to permit suoli action, whereby the sleeve 73 may be securely clamped within `he extremity of the punch carrier. 79 indicates an opening or passage leading from the interior of the portion 68 ofthe punch carrier to permit the discharge of chips cut by tubular punches when such are employed, such chips being permitted to pass up into the interior of the part 68 by reason of the opening 76a formed in the disk 74.

Located within the chip-receiving cavity 95 of the part 68 is a hollow cylindrical piston-like dev'ee 82 constituting a chip agitator, such device being` provided with a closed upper end or head 88 serving to adjustably limit theV capacity of said cavity for receiving chips discharged upwardly and into the chip agitator. rlhe chip agitator is formed with a portion 84 of reduced diameter, the main body of said chip agitator being of substantially the internal diameter ofythe lower portion 68 of the carrier, while the reduced portion 84 thereof fits within and slide-.bly engages the sleeve 73 of the punch holder. The chip agitator is provided in its side wall with-a chip discharge opening 85, this opening being` adapted to register with the opening` 79 in the carrier 68. ln order that the openings 85 and 79 may properly register the opposite sidesof the chip agiator are provided with slots 86 arranged 'n r engagement by the extremities ofthe screws 70, 7l which project inwardly beyond the walls of the carrier for this purpose, whereby any turning movement of the chip agitator is prevented. fis it is desirable that the punch holder be .readily positioned with the punches carried thereby in proper alinement with the direction of feed movement, the sleeve 73 of the punch holder has been provided with a centrally disposed.

if -shaped notch 87 and the chip agitator 82 is provided with a corresponding V-shaped lug 88. this construction it is only necessary to introduce the punch holder into the lower eitremity of the punch carrier and to turn the same until said lug 88 registers with the notch 8'?, in order to properly position the punch holder with respect to the punch carrier, whereupon the clamping;l screw 78 may be tightened to properly clamp the punch holder in operative position.

Extending' upwardly from the closed head 83 oi the chip agitator 82 is a rod 89 which may be lined to said chip agitator in any desired manner. This rod passes up through the tubular portion et the punch carrier 67., the upper end ot which is closed at 89a and is provided with an opening' 89" seiafinnto center the upper end ot the rod 89. Between the head 89TL and the head S3 oit the chip agitator is a spring 91. suirmuiding` the rod 89 and positioned thereby, said spring' being` so tensioned as to cause the chip apgitator 82 to move downwardly within the chamber 95 and normally to seat its lug 88 within the notch 87.

129 is an anvil member arranged in opposition to the punch for receiving` the blow thereof and 'for supporting' the material duringthe punching' operation, such vil havine' a surface 134: over which is arranged to be drawn a strip of paper l), such paper serving to cushion the blow of the punch and prevent damage to the edge thereof] Such cushion strip in the machine of the above noted application is ted rearwardly intermittently by suitable mechanism in time with the 'feeding' movement et the punch carrier and in accordance with the present invention it is contemplated that such movement ot the paper strip shall be simultaneous with and ot the same extent as the i'eed movement of the carrier, it bei understood that any desired type of mechanism suitable Yfor the purpose may be employed. Y indicates a strip oi' material rest ingr upon the paper strip .P in position to be operated upon by the punches and in Fie'. 5 such strip is'shown as having)- been scalloped alone' its edge by the empio ent ot a punch having a substantially semi-circular cutting edge such as herein shown Guided within an opening' 301 in the punch holder is a rod 302, auch tod extend* inn' upwardly within the chip agri ,ator and beine' provided with a collar 505% whirh serves to retain it in proper position, The lower extremity of said rod at is adapted to rest upon the upper surface oifvthe material Y while the upper extremity ou said rod is arranged to engage a lue' 305 projectingr from the interior suritare or the chip agitator. The sleeve 73 of the punch holder is provided with a circumtere tial groove 307 and the interior of the tubular portion 78 oit the carrier adjacent its open extremity is provided with a pair ot outstandingarcuate ribs 308, 305)n such ribs extending` in opposite directions 'from the slot 63ZL .and

gradually diminishing in radial height from said slot toward their opposite extremities.

rllhe operation of the above disclosed mechanism is as follows, it beine' understood that the punch carrier 68 is vertically reciprocated by means oit the linlrs 595 60 from suitable source or"4 power and that when the punch is down in engagement with the work the bracket G5 is moved rearwardly in the direction of feed to an amount corresponding to the spacing ot the periorations to be termed. The mechanism herein disclosed is equally capable of use with hollow tubular punches for forming perforations, or semi-circular punches forming scallops as above described.

is the punch 7G descends on the work resting; on the upper surface ot the paper strip l? the lower extremity 30d, ot the rod 302 whichA extends to a point somewhat below the cutting' edge of the punch contacts with the surface oit the material just prior to the Contact et the edge of the punch therewith. fis the punch carrier now moves down in performing the punching` operation, the rod 302 bears iirmly against the upper surface oit the material, and during,` the latter part of the down stroke oit the punch serves by engagement with the lua' 305 to slightly raise the chip agitator 82 in the cavity in opposition to the action et spring' 9L said spring' thus serving` to resiliently press the rod 302 against the material lVhile the punch is in the material the bracket is moved rearwardly and simultaneously therewith the strip oit paper P is given a rearward movement oi like extent.V rlhe material Y beine` operated upon is thus gripped or pinched between he upper surface of the paper and the lower extremity 301i ot' the rod 302 and is thereby positively carried rearwardly to the desired amount regardless oit the type ot punch employed beine' capable ot operation to teed the material even in the entire ab sence ot' a vpunf-h. At the end ot the rearward :feeding1 movement of the bracket 65 the punch carrier is airain raised littire` the rod 802 from the worin whereupon the spring` 91 again Lforces the rhip agritator S2 downward in the cavity 8.5i the upward and downward movements ol the chip agitator serving. to keep the chips tree in the receive iup; cavity and to insure their proper discharge therefrom. It will thus be seen that the rod SO2 has atwo-told 'function in serv as the feeding; member tor the material and also as an actuator ior the chip agitator,

1n changing; punch holders es is often necessary in the employment of machines or' this characte.` due to breakage of punches, or to changes in the type of punch to be employed, the operator sometimes tails to hold the punch holder properly in position while tightening the clamping screw 78,

whereby the punch holder is caused to project below itsA properposition which frequently results in the smashing of the parts upon starting the machine. Furthermore, duringthe operation of the machine it has sometimes occurred that the screw 7 8 would become loosened permitting the punch holder to drop, thus also producing disastrous results. ln the present form of the invention the operator in positioning the punch holder loosens the screw 7 8 which permits the opposite portions of the tubular carrier' 68 to expand, thus increasing the width of the slot 68a. The sleeve portion 7 3 of the punch holder is thereupon inserted in the end of the tubular carrier and pushed up until the ribs 308, 309 snap into the groove 307 which serves to temporarily hold the punch holder in position while the operator is tightening the clamping screw, the resiliency of the tubular carrier, however, permitting the operator to withdraw the holder from the carrier by the application of sufficient force, upon release of the screw. This arrangement of parts has been found in practice to insure the proper retention of the punch holder in its carrier at all times, thereby avoiding breakages of parts and requiring less care on the part of the opera tor.

A modified form of the work feeding device hereinbefore described is shown in Fig. 6, it being found in some cases desirable to have the feed element operate very'close to the cutting edge of the punch, such position of the feed element facilitating the operation of the machine in cutting scallops in curved lines wherein it is necessary to turn the work as the operation progressess This arrangement further avoids the formation of impressions in the surface of the material by the feed element at a distance from the edge which in some cases is objectionable.

In the form shown in Fig. 6, the punch carrier 67, punch holder, chip agitator 82a punch 76 with open cutting edge 76 are all similarto those hereinbefore described, the punch holder being also provided with the usual chip discharge opening 7 6a. As in the use of an open punch of the type herein disclosed, no chip passes up into the chamber 95, the opening 7 6a is therefore unnecessary -for permitting the passage of such chip and in the modified form this opening is made use of for guiding a work feed member comprising a pin 200, the lower end of which lies substantially within the hollow portion of the punch, and substantially concentric with the cutting edge thereof. rlhe upper end 201'of the part 200 is of enlarged diameter to retain the part in proper position in the guide opening 76, and the upper extremity of the member 201 engages the lower part of a spider-like head 202 at the Vlower end of rod 203 located within the chip agitator 82, the head 202 serving as a guide to properly position the member 203, the upper end of which rests against the lower surface of the head 83 of the chip agitator.

This arrangement of parts operates in substantially the same manner as does the device shown in Fig. l, the operation of which has already been described, the only essential difference being that in the present case the Vfeed member rests upon the work substantially within the scallop cut by the punch, whereas in the earlier described device the feed member contacts with the work at a substantial distance from the edge thereof, it being understood that in this form of device the pressure of the feed member upon the work is transmitted by the part 203 to the chip agitator as usual and serves to raise the latter slightly against the pressure of spring 91 which thus serves to resiliently press the feed member against the work.

By reason of the spider-lilre head 202 chips are free to pass throughout the length of the chip agitator as usual and the feed device herein described may be used if desired even when tubular punches are employed provided the latter are suitably grouped about the centrally located feed member.

ln Fig. 7 is shown in bottom plan a modified form of the feed member in which the rod 302X is provided at its lower extremity with a crescent shaped foot 500 which may be arranged to partially encircle the punch or punches employed and which provides a work contacting surface of suiiicient extent to avoid the formation of undesirable impressions or marks on the surface of the material.

Having thus described the invention, together with the preferred embodiment of the same and the mode of operation thereof, what l claim and desire to secure by Letters Patent of the United States is l. A machine of the class described having, in'combination, a reciprocable punch carrier, a punch carried thereby, and a work feeding element mounted upon said punch carrier and movable therewith. y

2. A machine of the class described having, in combination, a punch carrier reciprocable in a direction parallel to the feed of the work, a punch carried thereby, and an element for feeding the work, said element being reciprocable in time with the punch carrier.

3. In combination in a perforating machine, a punch carrier reciprocable in planes respectively substantially perpendicular and parallel to the surface of the material to'be operated upon, a cutting tool mounted upon said carrier and awork feeding element as-` sociated with said carrier and reciprocable therewith in a direction parallel to the surface of the material.

a. A perforating machine having, in combination, a punch carrier reciprocable in directions substantially at right angles to one another, a punch carried thereby and a work feeding element associated with said carrier and partaking of its movement in both directions.

5. A machine for operating upon` sheet material having, in combination, a reciprocable tool carrier, a tool mounted thereon, and a yieldable work contacting feed element associated with said carrier and reciprocable therewith.

6. A machine for operating upon sheet material having, in combination, a tool carrier movable parallel to the direction of feed of the material, a tool mounted thereon and a work contacting feed element mounted upon said `carrier and arranged to resiliently yield in a direction perpendicular to the surface of the work.

7. In a machine for perforating sheet material, in combination, a punch carrier arranged to have imparted thereto a movement in the direction of work feed, a punch mounted upon the carrier and means movable in time with the punch and carrier and engaging` opposite sides of the material to impart thereto a feeding movement.

8. A machine fory perforating sheet material having, in combination, a punch can riery arranged to have imparted thereto a work feeding movement, a punch carried thereby, a work contactingk feed member mounted upon said carrier and arranged to engage one side of the material and a second feed element arranged to engage the opposite side of the material and to have imparted thereto a feed movement in time with that of the carrier.

9. In a machine for perfor-ating sheet material, in combination, a punch carrier having a punch mounted thereon, and elements for engaging and gripping the material upon opposite sides thereof to impart thereto a feeding-movement, one of said elements being resiliently mounted upon said carrier.

10. In a perforating machine, in combination, a reciprocable punch, a carrier therefor arranged to have imparted thereto a work feeding movement, a paper strip for supporting the material in opposition to the blow of the punch and movable intermittently in the direction of feed in time with the movement of the carrier, a work feeding element mounted upon the carrier and resilient means for pressing said element into engagement with the work.

l1. In combination in a perforating machine, a punch carrier reciprocable substantially parallel to the, direction of work. feed,

a punch carried thereby, and a work contacting feed element supported by said carrier and comprising a rod slidable in said carrier and a spring for forcing said rod outwardly of said carrier and toward the work.

l2. In combination in a vmachine of the class described, a tool carrier reciprocable substantially parallel to the direction of work feed, and a work contacting feed element comprising a rod slidably supported by said carrier, a spring for projecting said rod outwardly of said carrier and into contact with the work, and means for limiting such outward movement of the rod.

13. In combination in a machine of the class described a punch, a carrier therefor having a receptacle therein for chips cut by the punch, a device for agitating chips within said receptacle and means for actuating said device comprising an element arranged to contact with the work.

14. In a perforating machine, in combination, a punch carrier reciprocable toward and from the work, and provided with a cavity, a reciprocatory chip agitator within said cavity, resilient means for projecting said agitator toward the extremity of said carrier and means arranged to contact with the work upon operative movement of the carrier and to move said agitator in opposition to said resilient means.

15. In combination in a perforating machine a reciprocable hollow punch carrier, a chip agitator in the form of a sleeve slidable within said hollow carrier, means for retaining said sleeve within said carrier, a spring for resiliently moving said sleeve toward the extremity of the carrier, and a rod slidable relatively to said carrier and having one end thereof operatively associated with said sleeve and having its opposite extremity arranged for contact with the work.

16. In combination in a perforating machine, a reciprocable punch carrier com prising a tubular portion having an open extremity, a chip agitator in the form of a sleeve slidable within said tubular portion, a punch holder mounted upon said. carrier and forming Va closure for the open end thereof, and a rod or pin slidably guided in an opening in said holder and having` one end operatively associated with said sleeve.

17. A machine of the class described having, in combination, a reciprocable punch carrier, a punch carried thereby and provided with an arcuate cutting edge, and a work feeding element mounted upon said punch carrier and substantially concentric with said cutting edge.

18. A machine for operating upon sheet material having, in combination, a tool carrier movable substantially parallel to the direction of feed of the material, a scalloping tool mounted thereon and a work contacting feed element mounted upon said carrier and arranged to resiliently engage the material substantially within the bounds ci' the incision made by the tool.

19. lnv combination, a periorating machine having a reciprocable punch carrier, a punch holder arranged ior operative engagement with said carrier, means for securing said holder in operative position relatively to said carrier and means independent of said clamping means.

2l. ln a machine of the class described, in combination, a reciprocable punch carrier comprising a tubular member having a longitudinal slot in one of its walls, a punch holder provided with a part arranged for insertion within said tubular member, means for drawing the opposed edges of said slot toward one another to clamp said tubular member about said part, and interengaging elements carried by said member and part respectively for preventing their inadvertent separation.

Y 22. 1n combination, in a machine of the class described, a tubular punch carrier ot resilient material having a longitudinal slot in its wall, a clamping screw havingengagement with said carrier at opposite edges of said slot whereby the internal diameter ot said carrier may be decreased by drawing the edges ot said slot toward one another, a punch holder having a cylindrical part arranged to be inserted within said carrier and to be clamped therein by the action ot said screw, said part having a circumlon vential groove, and an element projecting from the interior wall of said carrier and arranged to snap into said groove upon insertion of said part within the carrier.

23. A perorating machine having, in coinbination, a tubular punch carrier oi' resilient material having a longitudinal slot in its wall, means `for drawing the` opposite edges or" said slot together to decrease the interior diameter of said carrier, a punch holder having a cylindrical part arranged to be in serted within said carrier and to be clamped therein, said part having an external, circumferential groove, and an arcuate rib projecting from the interior wall of the carrier and arranged to snap into said groove upon insertion ot said part within the carrier.

24. ln combination in a perforating machine, a reciprocable punch carrier comprising a tubular portion provided with Ian open extremity, said tubular portion being longitudinally slit at one side adjacent its extremity, arcuate ribs upon the linterior of said tubular portion and extending in opposite directions Jtrom the slit therein, and a punch holder having a sleeve member arranged to project within the open extremity of said carrier and provided with a circum- Jerential groove for engagement byl said ribs. Y

25. ln aperiiorating macliine,in combination, a punch carrier comprising a tubular member having a longitudinal slot through its wall at one oi its extremities, a punch holder provided with a part arranged for in sertion within said tubular member, and to be clamped therein, said part having a circumferential groove, and a pairoip' arcuate ribs projecting 'from the interior oi' said tubular member upon opposite sides of said slot and of gradually decreasing radial height as they recede rom said slot, said ribs arranged to snap into said groove upon insertion oi the punch holder part within said tubular member.

26. A machine of the class described having, in combination, av reciprocable Vpunch carrier, a punch carried thereby, and a work feeding element mounted upon said punch carrier and movable therewith, said element having a work contacting surface of considerable extent.

2?. A machine for operating upon sheet material having, in combination, aV reciprocable tool carrier, a tool mounted thereon, and a yieldable work contacting feed element associated with said carrier and reciprocable therewith, said element comprising a work contacting foot of substantially crescent shape.

28. 1n a perforating machine, in `combination, a reciprocable punch, a carriertheretor arranged to have imparted thereto a work feeding movement, a paper strip for supporting the material in opposition to the blow ol the punch and movable intermittently in the direction ot feed in time with the movement of the carrier, and .a work feeding element mounted upon the carrier comprising a rod reciprocable toward and ii'oin said paper strip and a work engaging vlioot lined upon the extremity of said rod.

- 29. A machine of the class described having, in combination, 4a punch carrier recipe rocable in a direction parallel to the eed of the work, a punch carried thereby, andan element for feeding the work,said element being reciprocable in time with the punch carrier, and comprisingaJ work engaging toot of substantially crescent shape arranged to partially encircle said punch.

iio

30. A. machine of the classV described liavi of the Work, a punch carried thereby, and an element for feeding the Work, said element being reciprocahle in time with the punch carrier and comprising a work-engaging foot arranged substantially concentric with the punch.

3l. ln a perforating machine, in combination, a hollow punch having a tubular shank, and a holder for the punch comn pair of separahly connected memh said members having an openingl 'o a diameter substantially equal to V`ie external diameter of the punch shank, said opening and shank being se shaped as to prevent the shank from passing completely through the opening, and the other of said mem/)ers having an opening co-aXial with the first opening' and of a diameter suhstantiallyv equal to the internal diameter of the punch sha-nk.

32. In a perforating machine, in combination, a hollow punch having' a tubular shank, the rear end off said shank being of a diameter greater than the opposite end, and a holder for said punch comprising a pair of disk members one of said members having an opening' therethrough of a shape and size to permit said punch shank to seat snugly therein, and the other oit said memhers having' an opening co-aizial with said first opening 'but o1c lesser diameter, and

means for securing saidmemhers in superpcsed relation.

ln a perforating machine, in combination, a hollow punch having a tapering shank, and holder for said punch comprising a pair of superposed disks and means 'for securing said disks in juxtaposition, one or' said disks having a tapering opening therethrough for the reception o1c said punch shank, and the other of said disks having anY opening co-axial With said first opening but oli a diameter substantially equal to the internal diameter of said shank.

ln testimony whereof, l have signed my name to this specification.

DONALD NOBLE. 

